Liquitex Ceramic Stucco. That basically an untinted "flocking gel." I use it a lot on my bases. He's pretty exited about it and kept want to make fancy bases, but dour Daddy dissuaded him from anything too advanced. Although, it's not too late to put some interesting stuff on there.
I also converted a couple of non-warrior Neanderthals I bought at Historicon into firestarters for Tusk. The brass wire will be flaming branches when I'm done. The one on the right already has a stack of firewood in his arms and was natural for this. The one on the left was shaking out a fur and is either a little chubby or slightly pregnant...it won't be noticeable once they're painted.